Google地图不会显示用户位置，也不会对模拟器坐标不响应

Question

我正在尝试让Google地图显示用户的当前位置，并且每15秒左右更新一次。我使用新的FusedLocationProviderClient实现了API，但摄像头不以用户位置为中心，也不响应纬度和经度的变化。

我已经设置了Android Manifest和Gradle依赖项。我知道FusedLocationProviderClient.getLastLocation（）为null，因为以前没有提供过任何位置。所以我尝试实现LocationCallback和requestLocationUpdates来尝试更新位置，但这也不起作用。

我曾经想过，整个问题可能是由于Android Virtual Emulator无法模拟用户位置，但我不知道如何使用它。

我正在使用Nexus 5x API 26仿真器。 代码如下。

由于

public class ExploreActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    FusedLocationProviderClient fusedLocationClient;
    LocationRequest locationRequest;
    LocationCallback locationCallback;
    static final int LOCATION_PERMISSION_REQUEST = 101;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_explore);

        if (Build.VERSION.SDK_INT >= 23) {
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                Log.i("onCreate", "requesting permission");
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, LOCATION_PERMISSION_REQUEST);
            } else {
                initMap();
            }
        }

        fusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
        locationRequest = new LocationRequest();
        locationRequest.setInterval(15000); //interval between updates
        locationRequest.setFastestInterval(5000); //if there is another app updating more often, then simply take that location
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

        //setup location call back
        locationCallback = new LocationCallback() {
            @Override
            public void onLocationResult(LocationResult locationResult) {
                super.onLocationResult(locationResult);
                Log.i("callback", "working");
                for (Location location : locationResult.getLocations()) {
                    LatLng userLocation = new LatLng(location.getLatitude(), location.getLongitude());
                    Log.i("lat", Double.toString(userLocation.latitude));
                    Log.i("long", Double.toString(userLocation.longitude));

                }
            }
        };
    }

    private void initMap() {
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }


    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    @Override
    public void onMapReady(GoogleMap googleMap) {
        Toast.makeText(this, "Map is ready", Toast.LENGTH_SHORT).show();
        mMap = googleMap;

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            Log.i("onMapReady", "permission has been granted");
            mMap.setMyLocationEnabled(true);
            fusedLocationClient.getLastLocation().addOnSuccessListener(new OnSuccessListener<Location>() {
                @Override
                public void onSuccess(Location location) {
                    if (location != null) {
                        Log.i("onSuccess", "success");
                        LatLng userLocation = new LatLng(location.getLatitude(), location.getLongitude());
                        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(userLocation, 13));
                    } else {
                        Log.i("onSuccess", "failed");
                        //location is null possibly due last location not being initialized
                    }
                }
            });
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case LOCATION_PERMISSION_REQUEST:
                if (grantResults.length > 0) {
                    for (int i = 0; i < grantResults.length; i++) {
                        if (grantResults[i] != PackageManager.PERMISSION_GRANTED) {
                            Toast.makeText(this, "This app requires location permissions for the map to show!", Toast.LENGTH_SHORT).show();
                            return;
                        }
                    }
                    initMap();
                } else {
                    Toast.makeText(this, "This app requires location permissions for the map to show!", Toast.LENGTH_SHORT).show();
                }
        }
    }

    //run after onCreate method
    @Override
    protected void onResume() {
        super.onResume();
        startLocationUpdates();
    }

    @Override
    protected void onPause() {
        super.onPause();
        stopLocationUpdate();
    }

    private void stopLocationUpdate() {
        fusedLocationClient.removeLocationUpdates(locationCallback);
    }

    private void startLocationUpdates() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            fusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
            Log.i("startLocationUpdates", "started");
            //looper at null ensures it calls on this thread
        } else{
            //request permissions again (for safety)
            if (Build.VERSION.SDK_INT >= 23) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
            }
        }
    }

}